<template>
	<view>
		<my-search @click="gotoSearch"></my-search>
		<view class="scroll-view-container">
			<scroll-view scroll-y="true" :style="{height: wh + 'px'}" class="left-scroll-view">
				<block v-for="(item, index) in cateList" :key="index">
					<view 
					:class="['left-scroll-view-item', index === active ? 'active':'']"
					 @click=changeActive(index)
					>{{item.cat_name}}</view>
				</block>
				
				
			</scroll-view>
			
			<scroll-view scroll-y="true" :style="{height: wh + 'px'}" :scroll-top="scrollTop">
				<view class="cate-lv2" v-for="(item, index) in cateLevel2" :key="index">
					<view class="cate-lv2-title">
						/ {{item.cat_name}} /
					</view>
					<view class="cate-lv3-list">
						<view class="cate-lv3-item" 
						v-for="(item3, index3) in item.children" 
						:key="index3"
						@click="gotoGoodList(item3)"
						>
							<image :src="item3.cat_icon" mode=""></image>
							<text>{{item3.cat_name}}</text>
						</view>
					</view>
				</view>
			</scroll-view>
		</view>
	</view>
</template>

<script>
	import badgeMix from '@/mixins/tabbar-badge.js'
	export default {
		mixins: [badgeMix],
		data() {
			return {
				wh: 0,  // 当前设备可用高度
				cateList: [],
				active: 0,
				cateLevel2: [],
				scrollTop: 0
			};
		},
		onLoad() {
			const sysInfo = uni.getSystemInfoSync()
			this.wh = sysInfo.windowHeight - 50
			this.getCateList()
		},
		methods: {
			async getCateList(){
				const {data:res} = await uni.$http.get('/api/public/v1/categories')
				if (res.meta.status !== 200) {
					return uni.$showMsg()
				}
				this.cateList = res.message
				this.cateLevel2 = res.message[0].children
			},
			changeActive(index){
				this.active = index
				this.cateLevel2 = this.cateList[index].children
				this.scrollTop = this.scrollTop === 0 ? 1 : 0
			},
			gotoGoodList(item){
				uni.navigateTo({
					url: '/subpackage/goods_list/goods_list?cid=' + item.cat_id
				})
			},
			gotoSearch(){
				uni.navigateTo({
					url: '/subpackage/search/search'
				})
			}
		}
	}
</script>

<style lang="scss">
.scroll-view-container {
	display: flex;
	background-color: #ffffff;
	
	.left-scroll-view {
		width: 120px;
		
		.left-scroll-view-item{
			background-color: #f7f7f7;
			line-height: 60px;
			text-align: center;
			font-size: 12px;
			
			&.active {
				background-color: #ffffff;
				position: relative;
				
				&::before {
					content: ' ';
					display: block;
					width: 3px;
					height: 30px;
					background-color: #fb553c;
					position: absolute;
					top: 50%;
					left: 0;
					transform: translateY(-50%);
				}
			}
		}
	}
	
	.right-scroll-view-item {
		
	}
	
	.cate-lv2-title {
		font-size: 12px;
		font-weight: bold;
		text-align: center;
		padding: 15px 0;
	}
	
	.cate-lv3-list {
		display: flex;
		flex-wrap: wrap;
		
		.cate-lv3-item {
			width: 33.33%;
			margin-bottom: 10px;
			display: flex;
			flex-direction: column;
			align-items: center;
			justify-content: center;
			
			image {
				width: 60px;
				height: 60px;
			}
			
			text {
				font-size: 12px;
			}
		}
	}
}
</style>
